How to improve the S/N ratio of the circular polarizer with single-helical metamaterials?

YANG Zhenyu; ZHAO Ming

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How to improve the S/N ratio of the circular polarizer with single-helical metamaterials?

YANG Zhenyu 1 * #,ZHAO Ming 2

1.Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, WuHan 430074

2.Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan 430074

*Correspondence author

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Funding: Fundamental Research Funds for the Central Universities （No.HUST：Nos. 2010MS063 and 2011TS060）, Natural Science Foundation of China （No.Nos. 11104094, and 61007019）, Doctoral Fund of Ministry of Education of China （No.No. 200804871147）

Opened online:17 January 2012

Accepted by: none

Citation: YANG Zhenyu,ZHAO Ming.How to improve the S/N ratio of the circular polarizer with single-helical metamaterials?[OL]. [17 January 2012] http://en.paper.edu.cn/en_releasepaper/content/4460599

Circular polarizers with multi-helical metamaterials have two orders higher signal-to-noise (S/N) ratios than that of single-helical metamaterials. However, it has been a great challenge to fabricate such multi-helical structures with micron or sub-micron feature sizes. Is it possible for the single-helical metamaterials to obtain equally high S/N ratios as the multi-helical ones To answer this question, we systematically investigated the influences of structural parameters of single-helical metamaterials on the S/N ratios using the finite-different time-domain (FDTD) method. It was found that the single-helical metamaterials can also reach about 30dB S/N ratios, which are equal to the multi-helical ones. Furthermore, we explained the phenomenon by the antenna theory and optimized the performances of the single-helical circular polarizers.

Keywords:metamaterials; polarizer; nanophotonics

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